Steam-boiler.



PATENTBD SEPT. 5, 1905.

' F.BDGAR. STEAM BOILBR.

APPLICATION FILED NOV.21, 1901.

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No. 798,997. Y PATBNTBD SEPT. 5, 1905. E. P. EDGAR.

STEAM BOILBR.

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No. 798,997. PATENTED SEPT. 5, 1905.V

E. P. EDGAR.

STEAM BOILER.

APPLIOATION FILED Nov. 21, 1901.

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STEAM BOILER.

APPLIoATIoN FILED Nov.z1,1ao1.

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No. 798,997. PATBNTED SEPT. 5, 1905. E. F. EDGAR. STEAM BOILER.

APPLICATION IILED NOV. 21. 1901.

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PATENTED SEPT. A5, 1905'.

B. P. EDGAR STEAM BOILER. APPLxoAT'IoN FILED 11017.21, 1901,

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PATENTED SEPT. 5, 1905.

E. F. EDGAR.

STEAM BOILER.

APPLIUATION FILED NOV. 21. 1901.

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PATENTED SEPT. 5, 1905.

E. F. EDGAR.

STEAM BOILER.

APPLICATION FILED Nov.21,19o1.

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STEAM-BOILER.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application led November 2l, 1901. Serial Noy 83.199.

To /r/H 'lv/mnt 'it nifty (ro/worn:

Be it known that l, Ennis F. EDGAR, a citi- Zen of the United States, and a resident of 'oodbridg'e, in the county of Middlesex and State of New Jersey, have invented certain ne Y and useful Improvements in Steam-Boilers, of which the following is a specification. Figure l a one end or one front outside vertical view of a boiler embodying my improvements without the superheating attachment. Fig'. Q is a vertical section view through the center of the furnace at lines 2 2 on Fig. l. Figz is a sectional plan View at lines 3 3 on Fig. l with part of the grate-bars removed. Fig. l is a sectional plan view of one section with a half of furnace on each side. Fig. 5 is an end elevation view of one section with casing removed. Fig'. G is a detached enlarged view of upper support for side casing's secured to upper drum 2. Fig. 7 is a detached enlarged view of lower support for side casing secured to lower drum l. Fig. 8 is a plan view, partiallyv in section and partially in full, of my superheating attachment. Fig. E) is a vertical end view, partially in full and partially in section, broken away at lines l l in Fig. S to show my superheatingattachment. Fig. l0 is a vertical side elevation view of a boiler-section with drafteXit at each end.

My invention relates more particularly to a vertical water-tube,boiler usually of four drums or more and, where desired, a superheating attachment attached between the last outside row of water-tubes and the outside casing, substantially as shown in Figs. 8 and 9. There is one upper drum Q and one lower drum l in a section. These drums are connected by water-tubes ll. An important feature of this boiler is a long open furnace extending the length of the boiler and fired at each end of the boiler forming a large combustion-chamber, with a brick-lined casing at each end with special bricks 5, and brick arch forming the top of the furnace with bricks 3 and upper bricks l, and the grate of the furnace preferably extending the entire length of the furnace and preferably divided in the center and' preferably of a shaking type operated at each end of the furnace, and the boiler-sections composed of one upper drum 2 and lower drum l, connected by water-tubes M on each side of said furnace. Most of the water-tubes are exposed to the direct radiation of the heat from the furnace. Iart of the tubes are cut otlI from the direct radiation of theheat from the furnace by wall l2, supported on lugs 19, held in position by watertubes 13. Usually the draft-exits are at one end of the boiler, the same end as wall l2, although the boiler at the same time is fired from both ends, as shown in Fig'. Q, having` lire-doors 2Q at each end of the furnace. This boiler may be called a double-end-lired or double-front boiler.

In some cases I may construct draft at both ends of the boiler, as shown in Fig. et and Fig'. l0. In this case the heat is deflected on the majorityof the tubes through the center of the section, the tubes at each end being' cut off from the heat of the furnace by walls l2, as shown in Fig. Ll and Fig'. l0. I show a section in Fig. 4 with half of a furnace on each side of said section. This construction would be more applicable to large boilers containing more than two sections and more than one furnace-may be three sections and two furnaces or four sections and three furnaces. Fig. l0 shows a vertical side elevation of a boiler-section embodying' features of construction set forth in this case---upper drum 2, lower drum 1. connected by tubes 14, draftexit at each end ll, baffle-walls at each end l2, steam-exit l5, blow-off 16, grate T, extending length of furnace, bearing-bars 1T, supporting grate 7. In this view I do not show upper back arch 3 between upper drums 2, only showing here lower brick arches 3 between drums I. These lower arches vary in construction and position according to whether the boiler is to be constructed to lire at one end or both ends. In this view it is shown for a construction to be fired at both ends of the furnace. The object of these lower brick arches is to prevent the refrigerating effect from the heating-surface on the lire-bed, which retards combustion, and in a case of firing with bituminous coal these arches will prevent smoke. The gases after passing from under these lower arches enter into the larger secondary field of combustion, which takes place in the large combustionchainber between these arches and the upper arch supported by upper drum 2. The gases from the furnace after entering between tubes la pass between battle-walls l2, located on each side of the bank of tubes M at the draftexit end or ends, then the gases pass into gas exit or uptake ll, thence to the chimney. In Fig. Yl show one end of one of these sections, showing how the tubes are put in and how the side ci sings are supported, Fig. 7 showlOO IIO

ing a detached'enlarged view of lower support for side casing secured to lower drum 1, bracket 26 being riveted to lower drum 1, base-plate 27, upon which rests the cast-iron casing 6, and special re-brick lining 5, containing dead-air space 24. Asbestos felt 23 is also shown, which forms a lining between cast-iron 6 and special bricks 5.

Fig. 6 shows an enlarged detached view of upper support for side casing, bracket 29 beingriveted to upper drum 2. Angle-iron plate 28 being' bolted to bracket 29 holds cast-iron casing 6 in position and extends down far enough over casing 6 so as to hold said casing in position when the upper drum 2 is forced up by expanding of water-tubes 14 upon being heated, and as they contract by cooling this plate 28 slides back in former position, 'always keeping cast-iron plate 6 in proper position. Asbestos loop packing 25 is to form a cushion and make a tight joint during the expanding and contracting of water-tubes 14.

Up to fve-hundred-horse power I would usually build this boiler with one furnace and one section on each side of furnace, as shown in Fig. 3, showing one section on one side of the furnacewonly half of the furnace, not having room on the sheet to show more on a scale to be clear.- v

My superheating device, a plan view of which is shown in Fig. S, consists of receivingpipe 30 and discharge-pipe 32, connected by superheating-pipes 31. Receiving-pipe 30 is connected to steam-exit 15 by pipe 36. The iow of steam from receiving-pipe 30 into superheating-pipes 31 is regulated by valves 35, thereby regulating the temperature to be desired by letting the steam in as many of the superheating-pipes as desired or of any velocity desired, thereby absolutely controlling the degree of superheat desired into dischargepipe 32. Valves 34 next to discharge-pipe 32 are to be used in case of accident and a new superheating-pipe 31 necessary to be installed while the boiler is in operation, or Where only part of superheating-pipes 31 are desired to be in use Valves 34' may be closed to pre/ent back pressure into pipes 3l not being US@ rI`he advantages to be derived by a large furnace, as shown in Fig. 2, will readily be seen by one familiar with combustion-the possibility of obtaining perfect combustion by proper firing. This can readily be done with this boiler, as it is fired at each end, and having two fire-doors at each end it can be fired one-quarter of the grate at a time, thereby maintaining steam-pressure and obtaining perfect combustion, and in clearing lires, with small anthracite coal by clearing one-quarter of the lire at a time will not lower the steampressure, thereby depreciating the horsepower, which is a very important factor in a steam plant.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a vertical water-tube boiler one or more oblong sections composed of one drum above another connected by water-tubes having a draft-exit at each end of the section.

2. In a vertical water-tube boiler one or more oblong sections composed of one drum above another connected by water-tubes having a draft-exit at each end of the section, a furnace on each side of each section.

3. In a vertical water-tube boiler one ori more oblong sections composed of one drum above another connected by water-tubes, having a draft-exit at each end of the section, a furnace on each side of each section, and a wall extending from the draft-exit ends part of the way toward the center of the section.

4. In a vertical water-tube boiler one or more oblong sections composed of one drum above another connected by water-tubes having a draft-exit at each end of the section, a furnace on each side of the section,a wall on each side of the section extending from the draft-exit end part of the Way toward the center of the section.

5. In a vertical water-tube boiler one or more oblong' sections composed of one drum above another connected by Water-tubes having a draft-exit at each end of the section, a wall extending from the draft-exit end part of the way toward. the center of the section all substantially as s'hoWn and described and for the purpose set forth.

Signed at New York, in the county of New York and State of New York, this 14th day of November, A. D. 1901.

ELLIS F. EDGAR.

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